The older, dome headed screws that came with my mk12 upper used the 2.5mm L key. They were pretty easy to strip due to being made of what seemed to be softer metal. The ones I received use a 3mm L key. The part where the L key interfaces with the bolt has yet to show any wear. I would suggest using a high quality brand a L keys. KC tool has a wide variety of German tools that will last a life time. These bolts are an upgrade from the older dome headed style they used to use.
2 reviews for DDM4® Rail/SLiM Rail®/AR15 LITE Rail™ III/MFR/MFR XL Screw Pack
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DD –
Stripped 2 of the screws on my MFR mlok rail so I ordered these. The screws I received were not like the ones pictured. They were more flat and required a larger Allen wrench which I was fine with since that means you could torque it a little bit more. They fit just like the original screws. Very thankful for these upgraded screws
Bryce –
The older, dome headed screws that came with my mk12 upper used the 2.5mm L key. They were pretty easy to strip due to being made of what seemed to be softer metal. The ones I received use a 3mm L key. The part where the L key interfaces with the bolt has yet to show any wear. I would suggest using a high quality brand a L keys. KC tool has a wide variety of German tools that will last a life time. These bolts are an upgrade from the older dome headed style they used to use.